The guided-wave electro-optic prism has been fabricated by the process of photolithography on a Ti-diffused LiNbO3 waveguide. When it is used as an intensity modulator, the driving voltage is ±19V for 100% modulation depth, the fundmental bandwidth is 1.5GHz,and the driving power per unit bandwidth is 9.5mw/MHz. When it is used as a bipolar switch, the switching voltage is ±19V, and the switching time is 0.1ns.